(x) 1980 (Sept.) National Stamp Week 22c., a complete sheet (folded) showing black partly omitted on R.1/5-6, and to a lesser extent on Row 1/3-4 and 7, believed to be caused by the presence of residual cleaning fluid on the plate which prevents the take-up of the printing ink, the odd minor tone spot on reverse, unmounted mint. BW 878c var.
(x) 1980 (Sept.) National Stamp Week 22c., a complete sheet (folded) showing black partly omitted on R.1/5-6, and to a lesser extent on Row 1/3-4 and 7, believed to be caused by the presence of residual cleaning fluid on the plate which prevents the take-up of the printing ink, the odd minor tone spot on reverse, unmounted mint. BW 878c var.
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
